Improvement in sash and door-clamp



animi swag @anni @Wina GEORGE H.-HALL AND LORENZO D. FABRA, OEGERMANTOWN, PENN SYL- VANIA.

Letters Patent No. 98,765, dated January 11, 1870; mztcrlatetl amrlary7, 1870.

IMPROVEMENT IN SASH AND DOOR-CLAMP.

The Schedule referred to in these Letters Patent and making part oftheame.

To all 'whom it may concern:

Be it known that we, GEORGE H. HALL and Lo- RENZO I). FABRA, ofGermantown, in the county of Philadelphia, and State of Pennsylvania,have inventeda new and useful Improvement in Sash and Door-Clamp; andwe. do hereby declare that the following is a full, clear, vand exactdescription thereof, which will enable others Vskilled in the art tomake and use the same., reference being had to the accompanying drawing,forming part of this specification.

'lhis invention relates to a new and useful improvement in clamps forputting together sashes and doors, and for other purposes, whereby theoperation is greatly facilitated; and consists in arranging sliding jawson a main bar, one of which jaws is adjustable and fastened by a screw.'lhe other jaw is moved by means of a lever, with toggle-joints, thesash or door or other work heilig squeezed between the two jaws, as willbe hereinafter morefully described.

rlhe accompanying drawing represents a longitudinal view of the clampcomplete, showing the construction and method of operation.

A is Ithe bar, to which is attached the transverse stands or lugs forkeeping the clamp in a proper position, or fastening it to the bench.

. C is the adjustable jaw, to which is attached the shank D.

E is a band, fastening around the shank and bar A, which fit-s into arecess in the shank, as seen in the drawing, and is fastened by aset-screw, F, when the jaw is placed in the desiredV position.

It will be seen that the under side of this shank is p cut away, so thatwhen it is fastened by the screw it end of the bar A, at one end, and tothe curved portion o of the lever, at 1J, at the other end.

By this arrangement an equal pressure is exerted on both ends of thejoint-pins, at p and a, when the lever is operated, and the same therebyrendered capable of sustaining a much greater strain than wouldpbe thecase were a single bar employed.

.lhe lever K is pivoted to the forward end of the bar I, near the jaw H,in order to prevent the binding or friction ofthe band J on bar A, thatwould result if the connection or joint were made at the lrear end ofsaid bar l.

To accommodate this arrangement, the lever K' is bentlaterallyaround-the bar I, and thus brought into line. with it and thelug n.

A downward curve of the lever, at o, is rendered necessary, in order tomake the same self-fastening when the bars m are parallel to the bar A,the variations necessary for accommodating diiferent kinds of work beingmade, by means of the adjustable jaw O.

The advantages of this arrangement over the ordinary screw-clamp aremany, and must bevobvious to all.

Having thus described our invention,

XVe claim as new, and desire to secure by Letters Patc11t- 1. Theadjustable jaw C, with its lever-shank D, fastening-band `E, and screwF, in combination with the bar A, substantially as and for the purposesdescribed.

2. The combination of the jaw H, lever K, and toggle-bar m, with the barA, arranged substantially as described, for the purposes set forth.

3. The particular construction and arrangement, herein shown anddescribed, of the lever K, with reference to the bar I, the jaw H, bandJ, bar A, toggle-bars m, and the. lug n, whereby it is adapted tooperate4 as and for the purpose set forth.

GEORGE H. HALL. LORENZO D. FAR-RA.

Witnesses:

J osnPH KING, WM. O. HALL.

